Fuel injector pump structure



June 10, 1947. c. MESSNER I 2,421,899

FUEL INJECTOR PUMP smucwunz Filed Feb. 6; 1945 JNVENTOR.

49-7224 Mfaawen PatentedJune 1Q, 1947' R FUEL INJECTOR PUMP STRUCTURE Carlton Measner. Muskmn, Mloln, assignor to Continental Motors Corporation, Muskegon; Miola, a corporation of Virginia Application February 6, 19, Serial No. 576,381

3 Claims. (Cl. 103-154) I This invention relates to engines of the fuel injection type, and is more particularly related to the injector construction.

Most injectors employed with fuel injection engines comprise complicated structures, and consequently they cannot beeconomically produced, nor do they lend themselves readily to production manufacture. 1 n

It is an object of the present invention to construct an improved injector by providing a simplified construction that is applicable to production manufacturing with a minimum of time and labor, thus providing a device which can be very economically produced.

More particularly, it is the object of the present invention to construct an improved injector by incorporating improved inlet and outlet valve structures of simple construction and which are interchangeable, one with the other.

Another particular object of the present invention is to construct an improved injector comprising a pump actuated directly by a cam and embodying means associated with the pump plunger for sealing the device against leakage of any of the fuel. a

- For a more detailed understanding of my invention reference may be had to the accompanying drawings illustrating a preferred embodiment thereof in which like parts are referred to by like reference characters throughout the several views, and in which:

Fig. 1 of the drawing comprises a vertical sectional view of an injector pump incorporating the principles of the present invention,

Fig. 2 is a detailed cross-sectional view through a valve, and taken substantially on the line 2-4 of Fig. 1, and

Fig. 3 is another cross-sectional view showing the pump plunger sealing means, and taken on the line 3-3 of Fig. 1.

The present 'fuel injector pump is designed to be directly attached to an engine casing III, the injector pump housing II being bolted or otherwise secured to the engine casing as at H. A cam shaft is supported by said engine casing and carries a cam I3.

The under face of the injector pump housing H is bored out and tapped as at It to receive a pumping instrumentallty designated as a whble by reference character I5. This pumping in strumentality comprises a pump casing pro.

vided with an enlarged flanged base portion II seating on a gasket It in the bottom of said bored recess H. An externally threaded nut It is threaded into the bored and tapped recess of the It These inlet and outlet valves are thus inter- 2 injector pump housing. said nut seating on the flanged base portion Il-as at III to secure said pump casing to the housing.

A pump plunger II is slidably supported in the internal bore II of the pump casing, and preferably comprises a drill rod, same being machined and ground to have a fairly close fit in said bore 26. A cup shaped tappet 21 telescopes on the external surface of the pump casing. said.

pump plunger having a collar or sleeve 28 w'elded or otherwise permanently secured to the end of the plunger, and engaged by said tappet to advance the pump plunger when actuated by the cam I3. A spring 29 urges the tappet and plunger to a retracted position, said spring seating on a gland 30 against the pump casing and-a collar 3i seating on the collar 28. The pump casing I6 is recessed as at 35, about the pump-plunger and the collar or gland 30 is also recessed as at 36. A flexible and resilient gland 31 is enclosed in the recess 35, the enlarged flanged portion 38 of the gland 31 being clamped between the collar 30, and the end face of the pump casing by said spring 29. Said gland 31 is internally bored and closely fits around the stem of the pump plunger 25, the inner end of this gland being champferred or bevelled as at 40 so that any fuel pressure that may leak along the plunger into the chamber 35 under pressure, will exert a force against this bevelled face of the gland, this force resolving itself into component forces directed respectively axially of the plunger and radially inwardly thereof, thereby causing thegland to contact more closely with the sliding plunger and effectively seal against escape of the fuel along the plunger.

The injector is provided with an inlet valve 50 and an outlet valve 60, each of said valves comprising identical valve casings Ill each having a passage II controlled by a spring pressed ball valve 12. A stop 13 is assembled to the valve casing to limit the opening movement of the ball valve. The injector housing is bored as at for receiving the inlet valve structure and as at 8| for receiving the outlet valve structure. The inlet valve 50 is 'so arranged as to allow fuel flow into the pump chamber on the suction stroke of the pump plunger. The outlet valve 69 is reversed with respect to valve ill and is so arranged as to close on the suction stroke of the -..plunger and to open on the delivery stroke enlarged tapped bores Illa to assemblvsaid-ln let and outlet valves in place.

changeable one with the other, and consequently provide for a more economical manufacture. These valves are readily and easily assembled with a minimum of labor. The complete injector pump comprises a unit structure of simple cons'truction which is applicable for assembly with a fuel injection engine with minimum expense.-

Furthermore, this construction isvery compact and is particularly suited for direct assembly with '0 th engine.

Although I have illustrated but one form my invention and have described in detail but a single application thereof, it will be apparent to those skilled in the art to which my invention pertains, that various modifications and changes may be made therein without departing from the spirit of my invention or from the scope of the appended claims.

I claim: 1

1. A fuel injector comprising a casing having a casing having a counterbored recess, a flexible sleeve associated with said plunger and having a tubular projection embracing said plunger and fuel inlet passage and a recess with which said inlet passage communicates, a pump body seated in said recess and provided with a pump cylinder aligned with the inlet passage in said casing, said 'pump body having a flange, a nut threaded into said recess and engaging the flange to secure said pump body to said casing, a pump plunger operable in said pump cylinder, a tappet guided on the external surface of said pump body and engaging said pump plunger, and means actuating said tappet.

2. A fuel injector comprising a casing having a fuel inlet passage and a recess with which said 4 inlet passage communicates, a unitary pump assembly removably secured in said recess and comprising a pump body providedwith a pump cylinder aligned with the inlet passage insaidcasing,

housed for the most part in said recess, said sleeve constructed and arranged to be urged radially inwardly against said plunger to grip same when subjected to fuel back pressure which leaks past said plunger into said recess, spring means for retracting said plunger, said sleeve having a flange seating against said casing, a gland seatingon said sleeve flange, said spring yieldingly urging said gland against said sleeve flange to urge same "into sealing engagement with the end of said casing.

CARLTON MESSNER.

REFERENCES CITED The following references are of record in the file of this patent:

' UNITED STATES PATENTS Number Name Date 1,488,799 Smith Apr, 1, 1924 1,816,157 I Scott July 28, 1931 1,897,290 Wukrich Feb. 14, 1933 FOREIGN PATENTS Number Country Date France 1927 

